CN105408074B - Brushless DC motor and food processing equipment - Google Patents
Brushless DC motor and food processing equipment Download PDFInfo
- Publication number
- CN105408074B CN105408074B CN201480041394.3A CN201480041394A CN105408074B CN 105408074 B CN105408074 B CN 105408074B CN 201480041394 A CN201480041394 A CN 201480041394A CN 105408074 B CN105408074 B CN 105408074B
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- China
- Prior art keywords
- rotating speed
- motor
- brushless
- judgement unit
- dutycycle
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
- H02P27/08—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation
- H02P27/085—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation wherein the PWM mode is adapted on the running conditions of the motor, e.g. the switching frequency
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
- B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
- B26D1/01—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work
- B26D1/12—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis
- B26D1/25—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a non-circular cutting member
- B26D1/26—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a non-circular cutting member moving about an axis substantially perpendicular to the line of cut
- B26D1/28—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a non-circular cutting member moving about an axis substantially perpendicular to the line of cut and rotating continuously in one direction during cutting
- B26D1/29—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a non-circular cutting member moving about an axis substantially perpendicular to the line of cut and rotating continuously in one direction during cutting with cutting member mounted in the plane of a rotating disc, e.g. for slicing beans
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
- B26D5/00—Arrangements for operating and controlling machines or devices for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
- B26D5/02—Means for moving the cutting member into its operative position for cutting
- B26D5/06—Means for moving the cutting member into its operative position for cutting by electrical means
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Forests & Forestry (AREA)
- Mechanical Engineering (AREA)
- Power Engineering (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
- Harvester Elements (AREA)
- Food-Manufacturing Devices (AREA)
Abstract
The present invention provides a kind of brushless DC motor and food processing equipment.The brushless DC motor, it is used to, by making cutter rotation cut or cut target object, have：The brushless DC motor makes the axle that cutter rotates when being driven；Make the driver element of the brushless DC motor driving by PWM controls；Detection rotates and exports the rotary detecting circuit of rotation detection signal；And calculate rotation detection signal and differentiate the rotating speed judgement unit of rotating speed, the rotating speed judgement unit has：Differentiate and apply load to the brushless DC motor, and whether rotating speed is less than the lower limit rotating speed judgement unit of lower limit rotating speed；And the output unit of the result of the output rotating speed judgement unit, in the case where making the brushless DC motor be driven by specified dutycycle by the driver element, when the rotating speed judgement unit outputs the signal less than the lower limit rotating speed, the driver element setting value first dutycycle bigger than the specified dutycycle.
Description
Technical field
It is used to drive the brushless DC motor of cutter and with the brushless DC horses for driving cutter the present invention relates to a kind of
The food processing equipment reached.
Background technology
In the past, the device of the driving cutter with the rotary speed control for divided constant level.These devices are big
Use induction motor, the rotary speed carried out step by step by circuit structure is controlled more.
The content of the invention
Invent problem to be solved
But, the device of rotary speed is automatically adjusted according to cut-out, the target object crushed and few.
In the present invention, using driving cutter device in automatically controlled by using brushless DC motor rotary speed as
Purpose.
Means for solving the problems
It is used in an example of the present patent application to be a kind of by making cutter rotation cut or cut the brushless of target object
DC motors, it is characterised in that have：Axle, it rotates cutter when the brushless DC motor is driven；Driver element, it leads to
PWM controls are crossed to drive the brushless DC motor；Rotary detecting circuit, it, which is detected, rotates and exports rotation detection signal；With
And rotating speed judgement unit, it calculates the rotation detection signal and differentiates rotating speed, and the rotating speed judgement unit has：Lower limit rotating speed
Judgement unit, it, which differentiates, applies load to the brushless DC motor, and whether rotating speed is less than lower limit rotating speed；And output unit,
It exports the result of the rotating speed judgement unit, the brushless DC motor is driven by specified dutycycle by the driver element
In the case of dynamic, when the rotating speed judgement unit outputs the signal less than the lower limit rotating speed, the driver element setting
It is worth first dutycycle bigger than the specified dutycycle.
It is used in an example of the present patent application to be a kind of by making cutter rotation cut or cut the brushless of target object
DC motors, it is characterised in that have：Axle, it rotates cutter when the brushless DC motor is driven；Driver element, it leads to
PWM controls are crossed to drive the brushless DC motor；Rotary load detection unit, it detects rotary load and exports rotary load
Detect signal；And rotary load judgement unit, it calculates the rotary load detection signal and differentiates rotary load, the rotation
Turning load judgement unit has：Rotary load judgement unit is specified, it differentiates rotary load whether higher than specified rotary load；With
And output unit, it exports the result of the rotary load judgement unit, makes the brushless DC horses by the driver element
In the case of being driven by specified dutycycle, outputed in the rotary load judgement unit higher than the specified rotary load
During signal, the driver element setting value first dutycycle bigger than the specified dutycycle.
Also, the food processing apparatus involved by the exemplary other embodiment of the application has for making above-mentioned knife
Has the brushless DC motor of rotation.
Invention effect
, can be by being changed the corresponding rotating speed of load of the target object with cutting off or being turned according to the present patent application
The control of square, to reduce the power consumption of device.
Referring to the drawings and by detailed description below to the preferred embodiment of the present invention, it is of the invention above-mentioned and its
He can become more fully apparent feature, key element, step, feature and advantage.
Brief description of the drawings
Fig. 1 is the stereoscopic figure of motor involved in the present invention.
Fig. 2 is the sectional view of motor involved in the present invention.
Fig. 3 is equipped with the schematic diagram of the food processor of the motor of the present invention.
Fig. 4 is equipped with the schematic diagram of the grass mower of the motor of the present invention.
Fig. 5 is the flow chart for showing one embodiment of the present invention.
Fig. 6 is the flow chart for showing one embodiment of the present invention.
Embodiment
In this manual, the upside in the central axial direction of Fig. 1 motor is referred to as into " upside ", downside to be referred to as
" downside ".In addition, position relationship, direction when above-below direction is not the equipment for showing that loading is actual.Also, will be with central axis
Parallel direction is referred to as " axial direction ", and the radial direction centered on central axis is referred to as into " radial direction ", will be centered on central axis
Circumference be referred to as " circumference ".
<1. the overall structure of motor>
The motor of present embodiment is used as the driving source for rotating following cutter (blade), and for example rod-type is stirred
The related cutter (blade) of the food processing equipments such as device, hand mixer, blender, food processor；Grass mower, hay mover etc. with
The related cutter (blade) of farm implements；And other cutters (blade).Hereinafter, the equipment for being equiped with motor 1 is referred to as " driving dress
Put ".
Fig. 1 is the stereoscopic figure of the motor 1 involved by present embodiment.Fig. 2 is the sectional view of motor 1.Motor 1 is to use
In the brushless DC motor by making cutter rotation cut or cut target object.As shown in Figure 1 and Figure 2, motor 1 has quiet
Stop 2 and rotating part 3.Stationary part 2 is fixed on the housing of drive device (not shown).Rotating part 3 is supported to can be relative to
Stationary part 2 rotates.
The stationary part 2 of present embodiment has bracket 21, bottom bracket 22, stator core 23, coil 24, upper insulating part
25th, lower insulating part 26, circuit board 27 and bearing portion 28.
Bracket 21 keeps stator core 23 and bearing portion 28 (upper bearing (metal) 281).More specifically, bracket 21 and circuit
Plate 27 is contacted, and fixes to sandwich and keep stator core 23 by multiple fixed components 61 and bottom bracket 22.Bracket 21 is
There is lid substantially cylindrical shape.Bracket 21 is metal part.Bracket 21 is by making the metal using zinc as main component
Melt and flow into mould and be molded, i.e. so-called casting die is obtained part.In addition, the species of metal is not limited to zinc,
Other metals such as aluminium can be used.Also, manufacture method may not be casting die but be added by the others such as pressing
Work method is processed.Bracket 21 may not be metal system but resinous.
Bottom bracket 22 keeps stator core 23 and bearing portion 28 (lower bearing 282).Bottom bracket 22 is to have bottom general cylindrical shape
Shape.Bottom bracket 22 is metal part.Also, there are multiple holes (not shown) lower cover portion 221 is circumferentially arranged.By at this
Insertion screw is inserted in hole makes motor 1 be fixed with drive device.
Bottom bracket 22 by make the metal molten using zinc as main component and flow into mould be molded, i.e. so-called casting die
Come obtained part.In addition, the species of metal is not limited to zinc, other metals such as aluminium can also be used.Also, manufacture method
It may not be casting die but processed by other processing methods such as pressing.Bottom bracket 22 may not be metal system
But it is resinous.Also, in the present embodiment, by keeping stator core 23 and axle for the bottom bracket 22 of single part
Bearing portion 28 (lower bearing 282).Therefore, it is possible to which stator core 23 is precisely located each other with axle 31 described later.
Stator core 23 and coil 24 are the positions played a role as the armature of motor 1.Stator core 23 is by by silicon
The electromagnetic steel plates such as steel plate are vertically (along central axis J1 directions.It is same as below) stacked steel plate that is laminated constitutes.Stator iron
Core 23 has：Circular core-back 231；And it is radially oriented the prominent multiple magnetic pole tooths in inner side from core-back 231
232.Core-back 231 is kept by being sandwiched by bracket 21 with bottom bracket 22.The outer peripheral face of core-back 231 is except axial direction
It is the outer peripheral face of motor 1 outside top and axially lower part.The position of the convolute coil 24 of each magnetic pole tooth 232 of stator core 23
Circumferential width is less than two times of the width of the radial direction of core-back 231.Also, in the present embodiment, the number of magnetic pole tooth 232
Measure as six.
Herein, the outer peripheral face of stator core 23 except near upper end and lower end in addition to not by bottom bracket 22 and pop-up
Frame 21 is covered, and is exposed from bottom bracket 22 and bracket 21.That is, with the outer peripheral face of stator core 23 it is overall by bottom bracket 22 and
The situation that bracket 21 is covered is compared, in the present embodiment, outer peripheral face and bottom bracket 22 and the bracket 21 of stator core 23
The opposite area of radial direction it is small.Therefore, even if bottom bracket 22 and bracket 21 are magnet, do not allow to be also easy to produce from stator core 23 yet
Periphery bracket 22 and the leakage field of bracket 21 downwards.Therefore, it is possible to reduce the iron loss produced by bottom bracket 22 and bracket 21,
Improve the efficiency of motor 1.
Through hole 233 is formed with a part of core-back 231 of stator core 23 and the boundary of magnetic pole tooth 232.
In present embodiment, the number of through hole 233 is three.It is preferred that between through hole 233 is waited in the circumferential centered on central axis
Every ground configuration.In the present embodiment, interval of the through hole 233 across 120 degree from central shaft is configured.Through hole 233 is simultaneously
The groove for being not limited to this or being recessed to radially inner side.Fixed component 61 described later is through with through hole 233.
The cannelure 234 axially extended is formed with the outer peripheral face of stator core 23.At cannelure 234 insertion or
It is fitted together to the jut 228 of the jut 216 and bottom bracket 22 that have bracket 21.Thus, bracket 21 and bottom bracket 22 are carried out
The positioning of radial direction and circumference.
Coil 24 is made up of the wire being wound in around magnetic pole tooth 232.Coil 24 is wound in magnetic pole tooth across insulating part
232.In the present embodiment, wire is connected by so-called star-star connection.Therefore, U phases, V phases, W phases are drawn from coil 24
And this public four ends.Soldering is distinguished in circuit board 27 in each end being brought out.If by circuit board 27 to coil 24
Driving current is provided, then the magnetic flux of radial direction is produced at the magnetic pole tooth 232 as magnetic core.Then, magnetic pole tooth 232 and rotation are passed through
The effect of magnetic flux between the rotor core 33 of the side of portion 3, produces circumferential torque.As a result, rotating part 3 is relative to stationary part
2 are rotated centered on central axis J1.
Upper insulating part 25 and lower insulating part 26 are the resinous part being electrically insulated with stator core 23 and coil 24.It is upper exhausted
Edge part 25 is configured at the upside of stator core 23.Lower insulating part 26 is configured at the downside of stator core 23.In other words, stator core
23 are sandwiched between insulating part 25 and lower insulating part 26.Upper insulating part 25 covers the upper surface of magnetic pole tooth 232.Lower insulating part 26
Cover the lower surface of magnetic pole tooth 232.Also, upper insulating part 25 and lower insulating part 26 cover the side of magnetic pole tooth 232.By upper insulation
Part 25 and lower insulating part 26 constitute insulating part.In the present embodiment, by coil 24 from upper insulating part 25 and lower insulating part 26
On be wound in magnetic pole tooth 232 insulating part be fixed on stator core 23.
Upper insulating part 25 and lower insulating part 26 have between magnetic pole tooth 232 and coil 24, make magnetic pole tooth 232 and coil
The part of 24 electric insulations.Also, in the radial outside of coil 24, upper insulating part 25 has the iron core of continuous ring-type in the circumferential
Back insulation division 252.Core-back insulation division 252 is configured at the radial outside of coil 24.Core-back insulation division 252 is to make line
Position of the circle 24 when volume collapses with other part insulation.By stator core 23, coil 24, upper insulating part 25, lower insulating part 26
Assembly be defined as armature 29.
Circuit board 27 is the substrate with the distribution for driving current to be supplied to coil 24 from external power source.Circuit board
27 when overlooking in substantially circular plate shape.The external diameter of the external diameter of circuit board 27 and upper insulating part 25 described later is substantially uniform.Circuit
Plate 27 is fixed on the seat surface 2531 as the upper surface of upper insulating part 25.Also, the lower surface of circuit board 27 is provided with use
In the Magnetic Sensor 271 of the rotating speed of detection rotating part 3.Magnetic Sensor 71 is for example using Hall element.Alternatively, it is also possible to be equiped with
Substitution Hall element or the encoder increased in addition to Hall element.From the point of view of this viewpoint of the precision of rotation is detected, coding
Device can more obtain high accuracy.
Reference picture 2, bearing portion 28 is that the axle 31 of rotating part 3 is supported to the part to rotate freely.Bearing portion 28 is by upper axle
Hold 281 and lower bearing 282 constitute.Upper bearing (metal) 281 is held in the inner peripheral surface 2121 of the maintaining part 212 of bracket 21.Lower bearing 282
It is held in bottom bracket 22.Bearing portion 28 for example makes the ball bearing that outer ring is rotated against with inner ring using by spheroid.But, bearing
Portion 28 can also use the bearing of the other manners such as sliding bearing, FDB.
The rotating part 3 of present embodiment has axle 31, rotor retainer 32 and rotor magnet 33.Axle 31 is along central shaft
The generally cylindrical part that line J1 extends in above-below direction.Axle 31 is while support above-mentioned bearing portion 28 with central axis J1
Centered on rotate.The bottom of axle 31 is prominent to the lower section of bottom bracket 22.And the upper end of axle 31 is to the top of circuit board 27
It is prominent.The bottom or upper end of axle 31 are connected by the Poewr transmission mechanisms such as gear and the drive division of drive device.But,
The drive division of drive device can also be directly driven by axle 31.
Rotor retainer 32 is the part that is rotated together with axle 31 of radially inner side in stator core 23 and coil 24.This reality
The rotor retainer 32 for applying mode is made up of automatic steel.Rotor retainer 32 is shaped by cutting.Rotor retainer 32
Section is generally H shape, and with central portion 321 and cylindrical portion 322.Central portion 321 is located in the axial direction of rotor retainer 32
Centre, and it is pressed into axle 31 in inner circumferential surface.Cylindrical portion 322 is the radial outside in centrally located portion 321, and to central portion 321
The substantially cylindric position of axial the upper side and lower side extension.
Although being in the present embodiment generally H shape by the section that is shaped so as to of rotor retainer 32, not
It is limited to this.The shape of rotor retainer 32 can also be only formed as drum.Also, can also be by rotor retainer 32
It has been shaped so as to lid substantially cylindric, has been formed by punch process.Also, it can also be turned by laminated magnetic steel plate
Sub- retainer 32.Also, rotor retainer 32 can also be obtained by sintering.Also, can also be by laminated magnetic steel plate
Into part and by punch process thering is lid substantially cylinder-like part to combine and obtain rotor retainer 32.Though also,
It is so the rotor of so-called SPM types (Surface-permanent magnet, surface magnet) in the present embodiment, still
It is not limited to this.It can also be the rotor of so-called IPM types (Interior permanent-magnet, built-in magnet type).For
During IPM type rotors, preferred rotor retainer 32 is formed by laminated magnetic steel plate.
Rotor magnet 33 is drum, and is fixed on the outer peripheral face of the cylindrical portion 322 of rotor retainer 32.Rotor magnet
The surface of 33 radial outside is and stator core 23 and coil 24 diametrically opposite magnetic pole strength.Rotor magnet 33 is with N poles
Magnetic pole strength and the modes that are alternately arranged in the circumferential of magnetic pole strength of S poles be magnetized.In addition, on rotor magnet 33, can also
Replace the magnet of drum, and multiple magnet are configured in the way of N poles and S poles are alternately arranged in the circumferential.Also, as above institute
State, or IPM type rotors, rotor magnet 33 is built in rotor retainer 32.
(food processor)
Food processor 41 is illustrated as the example of drive device below.Reference picture 3, food processor 41 has
There are base portion 411, operating portion 412 and food processing portion 413.Motor 1 is accommodated in base portion 411.The axle 31 of motor 1 is towards food
The side of processing department 413 extends.Operating portion 412, which has, is used for the multiple switch that user operates.
Food processing portion 413 has container portion 4131 and blade 4132.Container portion 4131 be with the lid that can be opened and closed and
The part of the cup-shaped of handle.By user be put into container portion 4131 fruit such as the vegetables such as tomato, potato, orange and
Other food materials.Blade 4132 is driven by the axle 31 of motor 1.That is, axle 31 rotates blade 4132 when motor 1 is driven.Blade
4132 be corresponding cutter.If axle 31 rotates, blade 4132 rotates, and cuts off food materials.Thereby, it is possible to process food materials.
But, the rotation of blade 4132 is cut off during food materials, the scissile food materials of appearance are had according to the species of food materials and not allowed
Scissile food materials.In the example of above-mentioned vegetables, tomato is due to the softness containing many moisture therefore easily cuts off, and horse
Bell potato is because moisture is few and hard therefore is not easy cut-out.In this case, if equally to cut off the scissile food of appearance
Material and scissile food materials are not allowed, first, by when holding scissile food materials and have adjusted motor output, generation, which can not be cut off, to be not easy
The unfavorable condition of the food materials of cut-out.Again by when being not easy cut-out food materials and have adjusted motor output, be changed into the power of the required above come
Scissile food materials are held in cut-out, the problem that there is power consumption increase.
(grass mower)
Grass mower 51 is illustrated as the example of drive device below.Reference picture 4, grass mower 51 has handle portion
511st, bar portion 512, battery unit 513 and drive division 514.
Handle portion 511 is arranged on two places.Handle portion 511 is the portion that operator can hold when using grass mower 51
Position.The operating portion 5111 that operator operates grass mower 51 is configured with handle portion 511.
Bar portion 512 is bar-shaped position, and is connected with handle portion 511, battery unit 513 and drive division 514.
Battery unit 513 is located at one end side end of bar portion 512.There is battery unit 513 battery 5131 and battery 5131 to connect
The portion of terminal 5132 connect.Battery 5131 is supplied to the electric power of motor 1.Battery unit 513 is under operator's use state, battery unit 513
Positioned at the rear side of operator.
Drive division 514 is located at the another side end of bar portion 512.Drive division 514 have motor 1, reducing gear 5141 with
And blade 5142.Reducing gear 5141 has multi-stage gear, and the gear of the end with being configured at axle 31 is engaged.The axle of motor 1
31 when being driven, and the rotation of axle 31 is transferred to blade 5142 by reducing gear 5141.Blade 5142 is discoideus position, and
There is sword in outer peripheral face.Can be by the rotation of blade 5142, when grass is contacted with blade 5142, cut-out is careless.As a result, energy
Enough cut grass.
But, the rotation of blade 5134 is cut off during grass, the scissile grass of appearance is had according to the species of grass and is not easy cut-out
Grass.In the case of grass being cut in the place for holding scissile grass and not allowing scissile grass to mix, if it is desired to the same
Ground cut-out holds scissile grass and does not allow scissile grass, then first, when have adjusted motor output by the scissile grass of appearance, produces
It can not cut off and not allow scissile careless unfavorable condition.In addition, by be not easy cut-out grass have adjusted motor output when, exist and use institute
Need the power of the above and hold scissile grass to cut off, so that the problem of power consumption increase.If power consumption increases, generation can not
Unfavorable condition as grass mower is used for a long time.
(circuit structure)
To for driving the motor of cutter and the overview of device to illustrate.Pass through AC-DC power circuits or DC-DC
Power circuit applies voltage to control microcomputer and motor drive circuit.PWM controls, motor driving are carried out by controlling microcomputer
Circuit indicates dutycycle (DUTY ratios) to control microcomputer.Motor drive circuit is by the dutycycle paid come drive control motor.
Driver element is by controlling microcomputer and motor drive circuit to realize.That is, driver element drives motor 1 by PWM controls.Control
Microcomputer processed can also have any of rotating speed judgement unit, rotary load judgement unit and rotary load detection unit single
Member.Rotary detecting circuit detection rotates and exports rotation detection signal.Rotating speed judgement unit calculates rotation detection signal and differentiated
Rotating speed.Rotary detecting circuit can both be realized by controlling microcomputer, can also be realized by encoder, Hall element.
Control microcomputer, encoder, Hall element can be both installed on motor, can also be installed on device.
Fig. 5 is the flow chart for showing the action step involved by the exemplary embodiment of the present invention.Hereinafter, to logical
Cross encoder and realize that the action of embodiment during rotary detecting circuit is illustrated.
First, controlled by PWM to specify dutycycle as 10% come drive motor 1 (S1).At this moment, due to not applied to cutter
Application of load, therefore the rotating speed of motor is to specify rotating speed.Next, when target object is with tool contact, due to applying negative to cutter
Lotus, therefore the rotating speed of motor produces change.At this moment, the dutycycle being controlled is controlled to remain as 10% by PWM.
When the rotating speed of motor produces change, the rotation detection signal of detection rotation produces change.In Fig. 2 embodiment
In, rotation detection signal is formed by the pulse signal generated from encoder.Differentiate rotating speed by reading the pulse signal
Unit calculates rotating speed.More specifically, control microcomputer has rotating speed judgement unit, and rotating speed judgement unit passed through to the specified time
The quantity of interior pulse signal is counted.Rotating speed judgement unit calculates rotating speed by above-mentioned counting.That is, rotating speed differentiates single
Member carries out computing by microcomputer.Thereby, it is possible to constitute rotating speed judgement unit.
Under being higher than to the rotating speed of motor higher than the situation of lower limit rotating speed, the count value of pulse signal i.e. within a specified time
The situation of limit value is illustrated.In addition, in the example of above-mentioned food processor, the situation of processing tomato meets this feelings
Condition.Also, in the example of above-mentioned grass mower, cut-out holds scissile careless situation and meets such case.Rotating speed differentiates single
Member has lower limit rotating speed judgement unit and output unit.Lower limit rotating speed judgement unit differentiates to be applied load and turns to brushless DC motor
Whether speed is less than lower limit rotating speed.The result of output unit output speed judgement unit.In the case of this kind, dutycycle is set not change,
And rotating speed drop to it is lower than specified rotating speed in the state of make cutter rotate (S10).Then, during the processing of end object object, by
In not applying cutter load, therefore recover to specify rotating speed.By the control, due to being controlled without unnecessary PWM, and energy
Enough rotating speeds with minimum drive cutter, therefore, it is possible to the power consumption of restraining device.
Next, to the rotating speed of motor less than the situation of lower limit rotating speed, the counting of pulse signal i.e. within a specified time
Value is illustrated less than the situation of lower limit.In addition, in the example of above-mentioned food processor, the situation symbol of processing potato
Close such case.Also, in the example of above-mentioned grass mower, cut-out does not allow scissile careless situation to meet such case.
At this moment, rotating speed of the cutter due to not being sufficiently used for processing object object, therefore be extremely deceleration or halted state (S2).Cause
This, is that the count value of the pulse signal of rotation detection signal within a specified time can not be detected or reduced.Moreover, count value
During less than lower limit, rotating speed judgement unit is determined as being less than lower limit rotating speed.Thereby, it is possible to differentiate the rotating speed of motor by encoder
Less than the situation of lower limit rotating speed.At this moment, rotating speed is less than the signal output (S3) of lower limit rotating speed by rotating speed judgement unit.Therefore, lead to
Cross rotating speed judgement unit by rotating speed be less than lower limit rotating speed signal output when, drive control unit by change the first dutycycle come
Rotating speed is improved, so as to processing object object.In the present embodiment, the first dutycycle at this moment is set as 50%
(S11).That is, in the case where making motor 1 by driver element and being driven with specifying dutycycle, outputed in rotating speed judgement unit
Less than lower limit rotating speed signal when, driver element setting value first dutycycle bigger than specified dutycycle.In addition, in output speed
When being not less than lower limit rotating speed, motor 1 controls to drive (S12) to specify dutycycle as 10% by PWM.
As noted previously, as set the dutycycle that can be processed according to the hardness of target object, therefore, it is possible to most to close
Suitable power consumption is processed.As a result, being capable of the unwanted power consumption of restraining device institute.
Even if next, pair be set as the first dutycycle can not the situation of processing object object illustrate.This
In the case of, rotation judgement unit is calculated the count value for specifying the pulse signal in the time again.The counting of pulse signal
When value is less than lower limit, rotating speed is less than the signal output of lower limit speed by rotating speed judgement unit.Then, drive control unit is set
It is worth second dutycycle bigger than the first dutycycle.That is, when rotating speed judgement unit outputs the signal less than lower limit rotating speed, driving
Unit setting value second dutycycle bigger than the first dutycycle.Thus, even in can not be with the first dutycycle workpiece
, can be by being set as the second dutycycle come processing object object during body.In the present embodiment, the second dutycycle is set as
80% (S4).
Even if be set as the second dutycycle can not processing object object when (S5), can be by using identical rotating speed
Judgement unit sets the 3rd dutycycle.In the present embodiment, the 3rd dutycycle is set as 100%.In addition, passing through setting
Second dutycycle and can processing object object when, maintain the second dutycycle 80% (S13).Then, motor 1 is controlled by PWM
System is driven (S14) using specifying dutycycle as 10%.
In general, the rotating speed for being adapted to processing object object changes according to hardness, the viscosity of target object.For example, right
When as object being soft object, the rotating speed without increasing cutter just can be processed.But, target object is hard object
When, it is necessary to increase the rotating speed of cutter.If it is intended to processing hard target object with the less state of rotating speed, then there is cutter
Target object can be absorbed in or only it is the situation of friction object object.
When the viscosity of target object is low, because the load to cutter diminishes, therefore rotating speed can be less state.But
When the viscosity of target object is high, because the load to cutter becomes big, therefore rotating speed needs to become big.
Controlled by the setting of above-mentioned dutycycle, motor automatically selects the rotating speed of suitable processing object object.So,
In the device of driving cutter, due to unnecessary high speed can be avoided to rotate, therefore, it is possible to reduce power consumption.
Finally, though pair the 3rd dutycycle of setting can not the situation of processing object object illustrate.The situation
Same as abovely, rotating speed judgement unit differentiates whether rotating speed reduces (S7).But, even if being set as the 3rd dutycycle, also exist
In the case that rotating speed judgement unit judges rotating speed reduction, stop drive motor.That is, dutycycle is set as 0% by driver element.
At this moment, mistake can also be informed in a device.
In addition, by set the 3rd dutycycle and can processing object object when, maintain the 3rd dutycycle 100%
(S8).Then, motor 1 controls to drive (S9) to specify dutycycle as 10% by PWM.
Controlled by this rotating speed, can prevent from applying motor excessive load, and can prevent motor from sending out because of excessively stream
Raw failure.
In addition, to any dutycycle for being set as dutycycle in the first dutycycle, the second dutycycle, the 3rd dutycycle it
After illustrate.
Dutycycle is being changed, and cutter rotates, and when starting processing object object, apply load to cutter, rotating speed is finger
Determine below rotating speed.Certainly, at this moment rotating speed is higher than lower limit rotating speed.When then, through terminating processing object object after a while, by
Reduce in the load to cutter, therefore rotating speed is little by little improved.
At this moment, rotating speed judgement unit has the egulation rotating speed judgement unit for differentiating whether rotating speed is higher than egulation rotating speed.Rotating speed
Judgement unit also has to be set as specifying dutycycle and drives motor when outputing the signal higher than egulation rotating speed by dutycycle
Dynamic unit.
In addition, dutycycle is set as after specified dutycycle, even if driving the specified time, also negative is not applied to cutter
During lotus, make to stop rotational automaticly.Thus, the processing of target object is finished because the device for driving cutter can interpolate that, and
Stop automatic rotation, therefore, it is possible to fully automatically processing object object.
At this moment, can also be by whether calculating the pulse value in the time specified with rotating speed judgement unit to the load of cutter
Change to be judged.Also, the change value of current value can also be detected by other approach, differentiates and not higher than specifies
Rotary load.
Specified rotating speed in rotating speed judgement unit, lower limit rotating speed and egulation rotating speed are illustrated.Specified rotating speed refers to
It is to specify rotating speed by the speed setting of driving according to specified dutycycle.
In the first preferred embodiment, in the non-loaded state using the rotating speed driven with specified dutycycle as specify
During rotating speed, lower limit speed is less than the 70% of command speed.For example, when the target object of processing is soft object, even if with
The speed specified can be also processed.But, want processing object object, and rotating speed is changed into if less than 70%, then is difficult
Still it is processed with specified dutycycle.Then, lower limit rotating speed is set to specify less than the 70% of rotating speed, less than lower limit rotating speed
When, by the way that dutycycle is set into the first dutycycle, to make processing become possibility.
Also, during using the rotating speed driven with specified dutycycle as specified rotating speed, egulation rotating speed is to specify rotating speed
More than 85%.For example, through after a while and during the process finishing of target object, being mitigated to the load of cutter.Therefore, do not have
It is necessary to be set as dutycycle to specify more than dutycycle.That is, process finishing can be differentiated by differentiating rotating speed.Continue with specified
If more than dutycycle driving, then unnecessary electricity is consumed.Therefore, egulation rotating speed is set to specify the 85% of rotating speed,
, can be by the way that dutycycle be set as to specify dutycycle, to reduce unnecessary power consumption during higher than egulation rotating speed.
As the second preferred embodiment, rotary detecting circuit can also be used as with Hall element substitution encoder.That is,
Rotation detection signal is formed using the pulse signal generated by Hall element, and rotating speed judgement unit is to specifying the arteries and veins in the time
The quantity for rushing signal is counted, and when count value is less than lower limit, rotating speed judgement unit is determined as being less than lower limit rotating speed.Due to
Hall element is configured on the circuit board of motor, therefore saves space, can be used in the motor miniaturization of driving cutter.
Fig. 6 is the flow chart for showing the action step involved by the exemplary embodiment of the present invention.
In the 3rd preferred embodiment, the control of rotating speed is carried out by differentiating rotary load.Motor 1 is controlled by PWM
System is driven (S101) using specifying dutycycle as 10%.Motor 1 has rotary load detection unit and rotary load judgement unit.
Rotary load detection unit detects rotary load, and rotary load is detected into signal output.Rotary load judgement unit calculates rotation
Turn cutting load testing signal, and differentiate rotary load.Rotary load judgement unit, which has, specifies rotary load judgement unit and output
Unit.Rotary load judgement unit is specified to differentiate rotary load whether higher than specified rotary load.Output unit output rotation is negative
The result of lotus judgement unit.Then, in the case where making motor 1 by driver element and being driven by specified dutycycle, in rotation
Load judgement unit output higher than specify rotary load signal when, driver element setting value than specified dutycycle greatly first
Dutycycle.Thereby, it is possible to by differentiating rotary load, carry out the control of rotating speed.
For example, the method to the current value of the detection motor as the method for differentiating rotary load is illustrated.By inciting somebody to action
The threshold value specified is set as current value to differentiate specified rotary load.In the present embodiment, load is produced to cutter and processed
During target object, current value increase.The increase is detected to discriminate whether higher than the threshold value (S102) specified.The threshold value of current value
Setting can also be calculated by the absolute value of current value.That is, when the absolute value of current value is higher than rated current higher limit, rotating speed is sentenced
Other unit, which differentiates, is less than lower limit rotating speed.Thereby, it is possible to differentiate that motor 1 is less than lower limit rotating speed by the absolute value of current value.And
And, the difference value of the current value of specified dutycycle can also be calculated according to current value when producing load, and set relative to
The threshold value of the difference value.Alternatively, it is also possible to set multiple threshold values.For example, it is also possible to setting value it is bigger than specified rotary load the
One rotary load, can be with setting value second rotary load bigger than the first rotary load.
When current value is less than threshold value, motor 1 controls to drive (S111) to specify dutycycle as 10% by PWM.Separately
Outside, when higher than threshold value, setting value first dutycycle bigger than specified dutycycle.In the present embodiment, the first dutycycle is
50% (S103).
In above-mentioned, motor 1 with the first dutycycle higher than threshold value to drive when, again detect current value increase, and
Discriminate whether higher than the threshold value (S104) specified.At that time, when less than the threshold value specified, motor 1 using the first dutycycle as
50% drives (S112).Afterwards, the increase of current value is detected again, and when less than the threshold value specified, motor 1 is controlled by PWM
System is driven (S113) using specifying dutycycle as 10%.
In S104, when higher than the threshold value specified, it is set as value second dutycycle bigger than the first dutycycle.In this reality
Apply in mode, the second dutycycle is 80% (S105).Afterwards, the increase of current value is detected, and is discriminated whether higher than the threshold specified
It is worth (S106).
In above-mentioned S106, when less than threshold value, motor 1 drives (S114) using the second dutycycle as 80%.Afterwards,
Again detect current value increase, when less than the threshold value specified, motor 1 controlled by PWM using specify dutycycle as 10% come
Drive (S115).
In addition, in S106, when higher than threshold value, being set as value threeth dutycycle bigger than the second dutycycle.In this reality
Apply in mode, the 3rd dutycycle is 100% (S107).
Next, detecting the increase of current value again, and discriminate whether higher than the threshold value (S108) specified.At that time, when
During less than the threshold value specified, motor 1 drives (S109) using the 3rd dutycycle as 100%.Afterwards, the increasing of current value is detected again
Plus, when less than the threshold value specified, motor 1 controls to drive (S110) to specify dutycycle as 10% by PWM.But, i.e.,
When making also to judge that current value is higher than threshold value under the setting of the 3rd dutycycle, motor 1 stops driving.That is, driver element is set
Dutycycle is 0%.At this moment, mistake can also be informed in a device.
Also, in the motor 1 of present embodiment, rotary load judgement unit, which also has, differentiates whether rotary load is higher than
Provide the regulation rotary load judgement unit of rotary load.Motor 1 also has to be outputed higher than rule in rotary load judgement unit
Determine to be set as dutycycle in the case of rotary load to specify dutycycle, and the unit for driving motor.Thus, due to driving knife
The device of tool can interpolate that the processing for finishing target object and automatically stop the rotation, therefore, it is possible to fully automatically processing object
Object.
Also, when in the present embodiment, by specify dutycycle come the rotating speed that drives as specified rotating speed, regulation rotation
Load can also be more than the 85% of specified rotary load.Thus, for example, through the processing of end object object after a while
When, alleviate the load to cutter.It therefore, there is no need to be set as dutycycle to specify more than dutycycle.That is, can be by differentiating
Rotary load differentiates process finishing.Continue that more than dutycycle unnecessary electricity can be consumed to drive to specify.Therefore, it will advise
Determine rotary load to be set to specify the 85% of rotating speed, can be by the way that dutycycle be set as to specify when higher than regulation rotary load
Dutycycle reduces unnecessary power consumption.
Finally, in order to prevent from pinning with the state that cutter is absorbed in target object, cutter reverse rotation is preferably enable.Say below
The method of the reverse rotation of bright control cutter.
For example, in the first preferred embodiment, pulse signal of the rotating speed judgement unit to the encoder in the specified time
Counted.Dutycycle is set as after the 3rd dutycycle, when rotating speed judgement unit judges to be less than lower limit rotating speed, control
Microcomputer exports positive reverse rotation signal to motor.That is, when rotating speed judgement unit outputs the signal less than lower limit rotating speed, driving is single
Member output makes the rotating rotaring signal that the direction of rotation of motor 1 is inverted.Target object is absorbed in thus, it is possible to prevent motor 1 with cutter
State pin.Reverse rotation control can also be carried out before error informing in the first preferred embodiment.Also, driving
Unit can not also be after dutycycle to be set as to the 3rd dutycycle, and after the first dutycycle or the second dutycycle.
In addition, by by the specified rotation of motor, will uncharge rotation set dutycycle as 10%, can be further
Improve the rotating torques of motor.That is, when processing stiff materials, dutycycle is improved.When improving dutycycle, detection can be passed through
Rotating speed, current value, rotary load come by most suitable dutycycle processing object object.
Fig. 3 is the schematic diagram of food processor 41.Food processor 41, which has, to be used to make the motor that above-mentioned cutter rotates.
In addition, above-mentioned motor does not limit and is installed in food processor, general food processing equipment can also be installed in.That is, food adds
Work tool has the motor for rotating above-mentioned cutter.Thus, can be by entering in the motor of food processing equipment is installed in
Row is changed to the control of rotary speed corresponding with the load for cutting off target object or torque, reduces the power consumption of device.
More than, although the exemplary embodiment to the present invention is illustrated, but the present invention is not limited to
The embodiment stated.Also, the shape of the detail section on each part, can also be with the shape shown in each figure of the application not
Together.In addition, in each key element mentioned in above-mentioned exemplary embodiment, can also enter in the range of contradiction is not produced
Row is combined as.
The motor of the present invention is used as the driving source for rotating following cutter (blade), such as rod stirrer,
The related cutter (blade) of the food processing equipments such as hand mixer, blender, food processor；The farm implements such as grass mower, hay mover
Related cutter (blade)；And other cutters (blade).
Claims (10)
1. a kind of brushless DC motor, it is used for by making cutter rotation cut or cut target object, the spy of the brushless DC motor
Levy and be, have：
Axle, it rotates cutter when the brushless DC motor is driven；
Driver element, it drives the brushless DC motor by PWM controls；
Rotary detecting circuit, it, which is detected, rotates and exports rotation detection signal；And
Rotating speed judgement unit, it calculates the rotation detection signal and differentiates rotating speed,
The rotating speed judgement unit has：
Lower limit rotating speed judgement unit, it, which differentiates, applies load to the brushless DC motor, and whether rotating speed is less than lower limit rotating speed；With
And
Output unit, it exports the result of the rotating speed judgement unit,
In the case where making the brushless DC motor be driven by specified dutycycle by the driver element,
When the rotating speed judgement unit outputs the signal less than the lower limit rotating speed, the driver element setting value is than described
The first dutycycle for specifying dutycycle big, afterwards, the signal less than the lower limit rotating speed is outputed in the rotating speed judgement unit
When, the driver element output makes the positive and negative rotation signal that the direction of rotation of the brushless DC motor is inverted.
2. brushless DC motor according to claim 1, it is characterised in that
When the rotating speed judgement unit outputs the signal less than the lower limit rotating speed, the driver element setting value is than described
The second big dutycycle of first dutycycle.
3. brushless DC motor according to claim 1, it is characterised in that
During using in the non-loaded state by the rotating speed of the specified dutycycle driving as specified rotating speed,
The lower limit rotating speed is specify rotating speed less than 70%.
4. brushless DC motor according to claim 3, it is characterised in that
The rotating speed judgement unit also has egulation rotating speed judgement unit, and the egulation rotating speed judgement unit differentiates whether rotating speed is high
In egulation rotating speed,
The rotating speed judgement unit also has is set as that described specify accounts for when outputing higher than the egulation rotating speed by dutycycle
Sky compares and made the unit that the brushless DC motor drives.
5. brushless DC motor according to claim 4, it is characterised in that
During using by the rotating speed of the specified dutycycle driving as the specified rotating speed,
The egulation rotating speed is more than the 85% of the specified rotating speed.
6. the brushless DC motor according to any one of claim 3 to 5, it is characterised in that
The rotation detection signal is formed with the pulse signal generated by encoder,
The rotating speed judgement unit is counted to the quantity of the pulse signal within the specified time,
When count value is less than lower limit, the rotating speed judgement unit is determined as being less than the lower limit rotating speed.
7. the brushless DC motor according to any one of claim 3 to 5, it is characterised in that
The rotation detection signal is formed with the pulse signal generated by Hall element,
The rotating speed judgement unit is counted to the quantity of the pulse signal within the specified time,
When count value is less than lower limit, the rotating speed judgement unit is determined as being less than the lower limit rotating speed.
8. the brushless DC motor according to any one of claim 3 to 5, it is characterised in that
The rotating speed judgement unit is when the absolute value of current value is higher than rated current higher limit, and rotating speed judgement unit is determined as low
In the lower limit rotating speed.
9. the brushless DC motor according to any one of claim 3 to 5, it is characterised in that
The rotating speed judgement unit passes through Microcomputer Calculation.
10. a kind of food processing equipment, it is characterised in that
With the brushless DC motor for being used to rotate cutter any one of claim 1 to 9.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US201361867244P | 2013-08-19 | 2013-08-19 | |
| US61/867,244 | 2013-08-19 | ||
| PCT/JP2014/071127 WO2015025749A1 (en) | 2013-08-19 | 2014-08-09 | Motor |
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| Publication Number | Publication Date |
|---|---|
| CN105408074A CN105408074A (en) | 2016-03-16 |
| CN105408074B true CN105408074B (en) | 2017-09-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201480041394.3A Active CN105408074B (en) | 2013-08-19 | 2014-08-09 | Brushless DC motor and food processing equipment |
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| CN (1) | CN105408074B (en) |
| WO (1) | WO2015025749A1 (en) |
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| JP6486985B2 (en) * | 2017-04-03 | 2019-03-20 | ミネベアミツミ株式会社 | Motor drive control device, motor drive control method, and tube pump |
| DE102019211293A1 (en) * | 2019-07-30 | 2021-02-04 | BSH Hausgeräte GmbH | Domestic appliance with an automatically adjustable motor and method for operating a domestic appliance |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101098116A (en) * | 2006-06-30 | 2008-01-02 | 比亚迪股份有限公司 | Method for simulating continuous speed regulation of DC brushless motor |
| CN102347699A (en) * | 2010-07-30 | 2012-02-08 | 日立工机株式会社 | Inverter device and electrical power tool |
| WO2012108415A1 (en) * | 2011-02-10 | 2012-08-16 | 株式会社マキタ | Electric tool |
| CN103023395A (en) * | 2011-09-20 | 2013-04-03 | 日立汽车系统株式会社 | Brushless motor drive device |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60242815A (en) * | 1984-05-17 | 1985-12-02 | 松下電器産業株式会社 | Electromotive cooker |
| KR20080005776A (en) * | 2006-07-10 | 2008-01-15 | 삼성전자주식회사 | Control device for brushless dc motor and control method thereof |
| JP5510731B2 (en) * | 2010-07-30 | 2014-06-04 | 日立工機株式会社 | Electric tool |
-
2014
- 2014-08-09 WO PCT/JP2014/071127 patent/WO2015025749A1/en active Application Filing
- 2014-08-09 CN CN201480041394.3A patent/CN105408074B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101098116A (en) * | 2006-06-30 | 2008-01-02 | 比亚迪股份有限公司 | Method for simulating continuous speed regulation of DC brushless motor |
| CN102347699A (en) * | 2010-07-30 | 2012-02-08 | 日立工机株式会社 | Inverter device and electrical power tool |
| WO2012108415A1 (en) * | 2011-02-10 | 2012-08-16 | 株式会社マキタ | Electric tool |
| CN103023395A (en) * | 2011-09-20 | 2013-04-03 | 日立汽车系统株式会社 | Brushless motor drive device |
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| CN105408074A (en) | 2016-03-16 |
| WO2015025749A1 (en) | 2015-02-26 |
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